Accurate tool for ranking

Hey I have a problem. I have used both Rank Tracker and Market Samurai.
Both are displaying different results in Google, I want to look the position at USA (im not from USA). Which should I trust?

Rank Tracker 9
Market Samurai 16
Google Chrome google.com 8

Also does anyone recommend a web based tool to check your rankings that keeps a history if it increases or decreases. Also need to make a project for the domain and inside that project put posts urls from that domain with their respective keywords. Rank Tracker does not accomplish this, only Market Samurai, but I don´t like the way it handles history.

EDIT: I just found out that in Market Samurai there is a button to see ranking history in a graph. If Market Samurai shows accurate info then I will use this tool for all my sites.

Rank Tracker ( you can see your ranking last 10 years) just click the "progress" tab in the lower left.

I have Traffic Travis Pro (v4) and it produces pretty decent, straight forward graphs.
I also use Traffic Travis (free edition) for fast, on-demand ranking updates. V4 is a pain to force manual updates, you have to change how many results to check to get it to update more then once a day.

And I simply go into "private" browsing in chrome and search that way. If you don't do the private window big G saves your seraches and will show you your site based on your interests giving false rankings.

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